MINNEAPOLIS (AP) — Officials have told school lunch programs across the country to check to see if they have Smucker’s Uncrustables sandwiches that might contain peanut butter from a New Mexico company subject to a nationwide recall over salmonella contamination — and not to serve them.

The J.M. Smucker Co. says it used peanut butter from Sunland Inc. in “limited production runs” of 72-count bulk packs of the sandwiches that went to schools under the National School Lunch Program.

A spokeswoman says testing showed no problems. But as a precaution schools have been told to check if they still have any of the sandwiches from the recalled lots, which all have expired or expire soon.

Thirty-five illnesses in 19 states have been linked to Sunland. None have been linked to the Uncrustable sandwiches.